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Pachydiscus (Pachydiscus) egertoni

Cephalopoda - Ammonitida - Pachydiscidae

Taxonomy
Ammonites egertoni was named by Forbes (1846). It is a 3D body fossil. Its type locality is Pondicherry, which is in a Maastrichtian marine sandstone/claystone in the Valudavur Formation of India.

It was recombined as Pachydiscus egertoni by Matsumoto (1959); it was recombined as Pachydiscus (Pachydiscus) egertoni by Zaborski (1985), Kennedy and Henderson (1992).

Sister species lacking formal opinion data
P. gollevilensis, P. japonicus, P. suciaensis, P. vaju

Synonyms
Synonymy list
YearName and author
1846Ammonites ganesa Forbes p. 103 figs. Pl 7, fig 8
1846Ammonites egertoni Forbes p. 108 figs. Pl 9, fig 1
1958Parapachydiscus coalingensis Anderson p. 227 figs. Pl 65, figs 6,6a
1958Parapachydiscus ganesa Anderson p. 230
1959Pachydiscus egertoni Matsumoto p. 42 figs. Text-figs. 19，20
1985Pachydiscus (Pachydiscus) egertoni Zaborski p. 19 fig. 19a,b
1992Pachydiscus (Pachydiscus) egertoni Kennedy and Henderson p. 424 figs. Pl 12, figs 1-6,13-15,19-26; pl 13, figs 1-3; text-fig 4B

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassAmmonoidea()
orderAmmonitidaHaeckel 1866
suborderAmmonitinaHyatt 1889
superfamilyDesmoceratoidea(Zittel 1895)
familyPachydiscidaeSpath 1922
genusPachydiscusZittel 1884
subgenusPachydiscusZittel 1884
speciesegertoni()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

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Invalid names: Ammonites ganesa Forbes 1846 [synonym], Parapachydiscus coalingensis Anderson 1958 [synonym]
Diagnosis
No diagnoses are available
Measurements
partNmeanminimummaximummedians.d.
shell height523.912.843.018.514.1
shell diameter557.029.0103.045.035.2
shell inflation516.07.8031.012.510.6

Composition: aragoniteo
Environment: marinec
Locomotion: fast-movingo
Life habit: nektonico
Diet: carnivoreo
Vision: well-developedc
Created: 2005-01-28 02:27:03
Modified: 2009-10-08 14:14:55
Source: o = order, c = class
References: Kiessling 2003, Kiessling 2004

Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.60000 to 66.00000 Ma

Collections (8 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Campanian83.6 - 72.2Nigeria Pachydiscus egertoni (69626)
Late/Upper Campanian - Early/Lower Maastrichtian83.6 - 66.0USA (California) Pachydiscus egertoni (44266)
Early/Lower Maastrichtian72.2 - 66.0USA (California) Pachydiscus egertoni (83789 225933) Parapachydiscus coalingensis (86821)
Late/Upper Maastrichtian72.2 - 66.0India Ammonites egertoni, Ammonites ganesa (41428)
Maastrichtian72.2 - 66.0USA (California) Parapachydiscus coalingensis (83774) Parapachydiscus ganesa (215321)